Update .github/PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Description
+Add a meaningful description here that will let us know what you want to fix with this PR or what functionality you want to add.
+
+## Steps before you submit a PR
+- Please add tests for the code you add if it's possible.
+- Please check out our contribution guide: https://docs.spryker.com/docs/dg/dev/code-contribution-guide.html
+- Add a `contribution-license-agreement.txt` file with the following content:
+`I hereby agree to Spryker\'s Contribution License Agreement in https://github.com/spryker/opentelemetry/blob/HASH_OF_COMMIT_YOU_ARE_BASING_YOUR_BRANCH_FROM_MASTER_BRANCH/CONTRIBUTING.md.`
+
+This is a mandatory step to make sure you are aware of the license agreement and agree to it. `HASH_OF_COMMIT_YOU_ARE_BASING_YOUR_BRANCH_FROM_MASTER_BRANCH` is a hash of the commit you are basing your branch from the master branch. You can take it from commits list of master branch before you submit a PR.
+
+## Checklist
+- [x] I agree with the Code Contribution License Agreement in CONTRIBUTING.md